CVE-2026-47712: Dulwich path traversal in porcelain.format_patch via commit subject

CVE-2026-47712 · Severity: low · CVSS 3.3 · Published 2026-06-10

Dulwich is a Python library used to interact with Git repositories. A security flaw in the way it generates patch files allows a specially crafted Git commit to save files outside of the intended folder. This could allow an attacker to overwrite or create files in unexpected locations on a user's system if they process a malicious repository.

Technologies: dulwich (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2026-47712 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-47712 being exploited in the wild.
How severe is CVE-2026-47712?
Low severity, with a CVSS score of 3.3, published 10 June 2026.
Which products and versions are affected?
dulwich (PyPI) >= 0.24.0, < 1.2.5, ECOSYSTEM:introduced=0.24.0,fixed=1.2.5.
Is there a fix for CVE-2026-47712?
Yes. dulwich (PyPI): upgrade to 1.2.5 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-47712 attacked?
It is attacked with local access, in a software library.
Am I affected by CVE-2026-47712?
Check whether you run dulwich (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • dulwich (PyPI): upgrade to 1.2.5 or later
    pip install "dulwich>=1.2.5"

Technical details

A path traversal vulnerability exists in `dulwich.porcelain.format_patch` due to insufficient sanitization in the `get_summary` function. The function derives patch filenames from commit subject lines but fails to strip path separators (/, \), parent-directory components (..), or other hostile characters. An attacker can craft a commit with a malicious subject line to write patch files to arbitrary locations outside the specified output directory. This is exploitable when a user or service processes untrusted commits using the affected API. The issue is fixed in version 1.2.5 by implementing sanitization that mirrors Git's native behavior.

Affected products

  • Jelmer Vernooij Dulwich >=0.24.0, <1.2.5

Identifiers

  • CVE-2026-47712
  • GHSA-555p-6grf-mh7f
  • PYSEC-2026-2462

Timeline

  • 2026-05-19: patched: Fix commit c2446e51b authored
  • 2026-05-28: advisory: GitHub Security Advisory published
  • 2026-06-10: disclosed: CVE-2026-47712 published to NVD

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.